WATER & BUFFER SYSTEM

Question 1

Water is describe as ___ which is the ability to dissolve

Answer 1

Solvent

Question 2

____ dissolved in water

Answer 2

Ionic or polar

Question 3

___ substances dissolve poorly in water (ex: oil)

Answer 3

Non polar

Question 4

___ (which ionizes) and ___ (polar) are able to form hydrogen bonds, both dissolve in water

Answer 4

Sodium chloride
Ethanol

Question 5

Interact well with water and dissolve in it

Answer 5

Hydrophilic

Question 6

Non polar and does not dissolved in water

Answer 6

Hydrophobic

Question 7

Compounds that have both properties (Ex: soap)

Answer 7

Amphiphillic

Question 8

Non polar hydrocarbons (hexane) and lipids (Fats and cholesterol) are examples of ___

Answer 8

Hydrophobic

Question 9

Ionic compounds, alcohol, ketones , carbonyls and weak acid (phosphate, amino acids, sugar and carbohydrates) are examples of ___

Answer 9

Hydrophilic

Question 10

___ molecules don’t really interact with water, the water behaves very differently than it does with ions or molecules that form hydrogen bonding

Answer 10

Non polar

Question 11

Around each non polar molecules, water gets very __ aligning itself regularly

Answer 11

Organized

Question 12

We measure the proton concentration of a solution with pH, which is the negative log of the proton concentration. What is the formula?

Answer 12

pH = -Log[H+]

Question 13

If the proton concentration, [H+]= 10-7 M, then the pH is 7. We could just as easily measure the hydroxide concentration with the pOH by the parallel equation, what is the Formula of -OH (hydroxide)

Answer 13

pOH = -Log[OH- ]

Question 14

In pure water, dissociation of a proton simultaneously creates a hydroxide, so the pOH of pure water is 7, as well. This also means that. What is the formula after getting the pH and pOH?

Answer 14

pH + pOH

Question 15

refer to a substance which has protons that can dissociate (come off) when dissolved in water.

Answer 15

Acid

Question 16

a substance that can absorb protons when dissolved in water.

Answer 16

Base

Question 18

A buffer system usually consist of a ___ and its ___ or a ___ and its ___

Answer 18

Weak acid
Conjugate base
Weak base
Conjugate acid

Question 19

When an acid H+ is added to the solution, the conjugate base buffer neutralize it and vice versa

Question 21

What is the term of waters ability to resist changes in temperature

Answer 21

High specific heat

Question 22

What is the effect of adding a strong acid to a neutral solution?

Answer 22

The pH decreases

Question 23

What is the pH of a solution with a low concentration of hydrogen ions?

Answer 23

High pH

Question 24

What is the pH of a gastric acid in the stomach?

Answer 24

1-2

Question 25

What is the term for the ability of water to move through narrow spaces against gravity?

Answer 25

Capillary action

Question 26

What is the term for the process by which water molecules stick to other surfaces?

Answer 26

Adhesion

Question 27

What is the term for the movement of water through a plant from roots to leaves?

Answer 27

Transpiration

Question 28

What property of water allows it to form droplets?

Answer 28

Cohesion

Question 29

What is the term for Waters ability to resist changes in temperature?

Answer 29

High specific heat